Penn Jillette is an atheist who recognizes the heart of evangelism. His quote can be found here. https://livingwaters.com/mystery-man-who-gave-bible-to-famous-atheist-revealed/
Here is a quote from Charles H. Spurgeon.
John 17:3, And this is eternal life, that they know you, the only true God, and Jesus Christ whom you have sent.
This verse is not meant to convey “know of”. There are lots of people who know of God but they don’t truly know him. The word know (ginōskō) in John 17:3 is the same work used in Luke 1:34 when the angle of the Lord told Mary she will conceive a baby and Mary responded. Luke 1:34, Then Mary said to the angel, “How can this be, since I do not know a man?” HCSB translation says, since I have not been intimate with a man. The Amplified Bible also uses the word intimacy. Eternal life comes from an intimate relationship with Jesus and not just a head knowledge. Do you really know God? You can get to know God and develop that intimate relationship with him by reading his Word and by talking (praying) to him.
Ephesians 5:26, … having cleansed her by the
washing of water with the word.
1 Corinthians 6:11, And such were some of you. But
you were washed, you were sanctified, you were justified in the name of the
Lord Jesus Christ and by the Spirit of our God. See also
John 15:3, You are already clean because of the word I
have spoken to you.
Acts 22:16, And now what are you waiting for? Get up,
be baptized, and wash your sins away, calling on His name.
Ezekiel 36:25, I will also sprinkle clean
water on you, and you will be clean. I will cleanse you from all your
impurities and all your idols.
Titus 3:5, he saved us, not because of righteous
things we had done, but because of his mercy. He saved us through the washing
of rebirth and renewal by the Holy Spirit.
John 3:5, Jesus answered, "Truly, truly, I tell
you, no one can enter the kingdom of God unless he is born of water and the
Spirit.
Jeremiah 17:5, Thus says the LORD: “Cursed is the man who trusts in man and makes flesh his strength, whose heart turns away from the LORD. Don’t blindly trust in your priest, pastor, church, Mom, Dad, or anyone else for your salvation. They could be wrong, and you would pay a high price if they are. Get it straight from the Word of God.
John 17:17, Sanctify them in the truth; your word
is truth.